Bolt is RH thread, 3.75" long and comes with locking goo on the threads so it MAY not come out easily.
You say it's broken a ways up inside the crankshaft, are there threads visible or is that area of the bore unthreaded?
Either way, I would make up a guide tool threaded or not as dictated by the bore that fits inside and has a pilot hole/drill bit guide drilled through (luckily I have a lathe).
Inset or screw the guide into the crankshaft, then you can drill a perfectly centered hole in the remains of the bolt, make it as large as possible to allow the use of a larger extractor that won't break as easily, and HOPEFULLY it will screw out.
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